Michell Instruments QMA401 User Manual page 89

QMA401 User's Manual
Register Configuration M — System Warning Flags (Register 230), Analyzer Status
Alarm Relay Selection Mask (Register 9)
1=Warning or fault, 0=OK
15 14 13 12
Bit HEX
0 0001
1 0002
2 0004
3 0008
4 0010
5 0020
6 0040
7 0080
8 0100
9 0200
10 0400
11 0800
12 1000
13 2000
14 4000
15 8000
Analyzer Status Alarm selection mask (in Register 9) allows user to set which condition(s) trigger
status relay alarm 4.
Michell Instruments
11 10 9 8
Oven temperature unstable. Oven temperature has not been
stable within ±0.01C of setpoint for continuous 5 minutes. (Process
alarms de-energized, both analog outputs at fault condition
Enclosure temperature too high. Enclosure (System) temperature
too high. (> Oven temperature setpoint -2°C)
Flow control error. MFC Flow control error (by >5ml/m of fl ow
target)
Cell pressure sensor error. (under 4 mA, over 20 mA or no signal)
Ext Press sensor error. (under 4 mA, over 20 mA or no signal)
Field cal error. Internal moist generator drift, instrument excessive
drift or desiccant dryer deterioration requiring very large corr. factor
(<0.2500 or >4.000). In this case the correction factor would be set
to 1.0. (Checked after fi eld calibration)
Beat freq. out of range. Beat frequency Under/Over acceptable
range (<1500 Hz, >20000 Hz)
ppmV over range. ppm
Oven temperature sensor fault. Oven temperature sensor fault
(Process Alarms de-energized, Fault Alarm Active, both Analog
outputs at fault condition (ADC <10, >4000 counts)
mA output 1 error. (o/c or high resistance at output)
mA output 2 error. (o/c or high resistance at output)
Oscillator board comms error. Oscillator board comms. error or
board not present (checked on startup)
Ethernet board comms. error. Ethernet Board comms. error or
board not fi tted (checked on startup)
Dryer due for service. Desiccant Dryer due for service or
replacement (>5000000ppm
Moisture generator due for service. Internal Moisture Generator
due for service or replacement (>1030days)
Calibration Alarm
In calibration mode or data held (or both)
7 6 5 4
Warning Condition
over instrument range (>2000ppm
V
)
V
APPENDIX C
3 2 1 0
)
V
79